Patent US2991878A successfully refreshed from Google Patents.
US2991878A
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US
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Heavy media separation of porous material
Assignee: Minerals and Chemicals Philipp Corp
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Filing: 1957-08-07
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Granted: 1961-07-11
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Expires: 1977-08-07
Abstract
No abstract record available.
Inventors
- 👤 Wright W Gary
- 👤 James B Duke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:42
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/009; B01J21/00; B01J21/20; B01J38/00; B01J38/72; B03; B03B; B03B1/00; B03B5/00; B03B5/28; B03B5/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
55 words
THE PROCESS FOR PREVENTING ADHESION OF THE COMMINUTED SOLIDS COMPONENT OF A HEAVY MEDIA TO POROUS GRANULAR SOLIDS TREATED IN SAID HEAVY MEDIA WHICH COMPRISES FILLING THE PORES OF SAID GRANULAR MATERIAL WITH A NON-VISCOUS LIQUID SUBSTANTIALLY IMMISCIBLE WITH AND HAVING A SPECIFIC GRAVITY LESS THAN THAT OF THE LIQUID COMPONENT OF SAID HEAVY MEDIA.
References Cited (Backward Citations)
US2631968A
Cited
US1895504A
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US2643215A
Cited
US2483372A
Cited
US2699256A
Cited
US2832470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |